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Java -> operator

I know that -> is used for lambda expressions with the syntax ()->{}.

But I saw this code: file -> file.isFile() - with no () and {}. What does it do?

Solution

  • () is not required when you have a single argument and {} is not required when your lambda body is a single expression.

    See the Java tutorial for further information and the Java Specification for a more formal description of the syntax.